#include <iostream>
#include <cmath>

class Solution
{
public:
    int main()
    {
        int appleCount, eachTime, totalTime;
        std::cin >> appleCount >> eachTime >> totalTime;
        if (eachTime == 0)
        {
            std::cout << 0;
            return 0;
        }
        int ateApples = ceil(1.0 * totalTime / eachTime);
        if (ateApples > appleCount)
        {
            std::cout << 0;
        }
        else
        {
            std::cout << appleCount - ateApples;
        }

        return 0;
    }
};

#ifndef __LOCAL_TEST__
int main()
{
    return Solution().main();
}
#endif